[Bug c++/70441] vector<__float128> crashes on two push_back calls with -mavx

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70441

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
C++ does not support dynamic allocation of over-aligned types (usually SIMD
vectors, but also __float128 on x86 for instance). C++17 will partially support
it (operator new), but still not fix the std::vector case, which has to wait
until C++20 (assuming someone actually does the work of writing and pushing a
proposal) :-(

Well, actually, you can always write your own allocator which provides properly
aligned memory.